Plus sized mtn bike armour?

Last week I bought my very first mountain bike for winter riding and trail riding.

I figure to be on the safe side, I should get some knee and shin guards and a full face helmet. The full face helmet will be fairly easy to buy but I'm not so sure about the sizing of the knee and shin guards.

Anyone have any experience with larger legs and armour? Any preferable type? Like just for the knee or go for the knee and shin type guards? Any other protective gear for the clumsy and awkward? Seriously, I'm a complete klutz. People who've known me since I was a kid are amazed I'm still around.

I also have a mouth guard on my list. Maybe all this gear is overkill but I've grown accustomed to teeth and skin on my knees.

By the way, I love LOVE my new 14" Jamis Durango 1.0 femme. I've taken it out on short, beginner trails and I am looking forward to ice biking (if we have a winter) and riding dirty trails.

For sizing comparison, I've got 17" calves and the T.H.E. pads fit fine. They're open backed and have generous elastic and long straps on the LG/XL size. (Got mine at JensonUSA along with all my other armour)

The TLD shorts run a bit snug and they max out at a 2XL. I've got a 36" waist and 25-ish quads and the XLs are a bit on the "compression shorts" side.

The gloves, helmet, and elbow pads all have no issues for fit.
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All that said - I wouldn't worry too much about getting all that stuff unless you're flinging yourself downhill as fast as you can, or jumping things taller than your shoulders.
A mouthguard, maybe, if you're really worried about your chompers. Upper body armor, I wouldn't worry about it; same with the hip/tailbone shorts. Take a look at softshell shinguards if you want something, but if you're not really throwing yourself down the hills, even kneepads might be overkill.

"I feel like my world was classier before I found cyclocross."
- Mandi M.